LT3653

PRODUCTION

1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications

Part Models: 4
1ku List Price: Starting From $3.01

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Overview

Wide Input Range:
- Operation from 7.5V to 30V
- Overvoltage Lockout Protects Circuit Through 60V Transients
Operates with LTC Bat-Track^™ Li-Ion Battery Chargers to Maximize Efficiency
No Reverse Discharge Path from V_OUT to V_IN
Programmable Output Current Limit
Integrated BOOST Diode
Thermal Protection
Small Application Size
Thermally Enhanced 2mm × 3mm DFN Package

The LT3653 is a monolithic current mode PWM step-down regulator with programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize the battery charger efficiency. Output current limit provides accurate control over system power dissipation.

The wide operating input voltage range of 7.5V to 30V suits the LT3653 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power. Input overvoltage protection allows the LT3653 to handle 60V input transients.

The LT3653 control pin, V_C, is available for external battery tracking control, Bat-Track. The LT3653 will block output discharge during an open or shorted input.

The HVOK pin indicates that the internal bias supplies are present and no faults have occurred (i.e., overtemperature and input overvoltage and undervoltage). The LT3653 includes a 1.5MHz frequency oscillator, internal compensation, and an internal boost diode to minimize the number of external components. The LT3653 is available in an 8-lead (2mm × 3mm) package with exposed pads for low thermal resistance.

Applications

Battery Powered Equipment
Portable USB Devices – Cameras, MP3 Players, PDAs
Automotive Battery Regulation
Multiple-Source Battery Chargers

Part Models: 4
1ku List Price: Starting From $3.01

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3653EDCB#TRMPBF	8-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3653EDCB#TRPBF	8-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3653IDCB#TRMPBF	8-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3653IDCB#TRPBF	8-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management